[issue4374] Pickle tests fail w/o _pickle extension

[Alexandre Vassalotti]

Alexandre Vassalotti <alexandre at peadrop.com> added the comment:

I think the best way to fix this is to add sanity checks similar to the
ones in _pickle. The checks are obviously useless in pickle.py, but I
think it is simpler than to try to skip tests, and it gives a nicer
error message to people who forget to call __init__ when subclassing.

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keywords: +patch
Added file: http://bugs.python.org/file12105/fix_issue4374.diff

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